Fix collaborator validation

[ryaplots]

Summary

This PR fixes a validation bug in the collaborator form, also fixing the e2e tests

Changes

• Update test function

Testing

1. Log into the console
2. Try creating a collaborator - should go through
3. Try submitting the form without a collaborator - should be an error on the field saying the collaborator is required

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.